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I'd say statement earrings, a pretty, small braclet, flats/pumps/ankle booties. Hair: low bun, pretty half-up, sleek pony, possibly a braid. A lot of things can go with this depending on the occasion.
That looks more like a jewel neck than a boat neck. With a boatneck (rather high neckline that extends shoulder to shoulder) a problem to be aware of is trying to wear a topper with it as it tends to bunch up under one. Not all do this, so it may take trial and error. Your dress is lovely and a beautiful color.